| Due to the booming technology,the networked control system has become a popular topic of research at home and abroad,and it has attracted the attention of many researchers.Networked control system is a complex control system that introduces communication network in the closed loop of control,which consists of sensors,controllers and actuators,and transmits signals through communication network.Networked control systems are widely used in fields such as intelligent transportation,remote viewing,and automated factories,and have the advantages of low cost,and easy maintenance.However,the introduction of communication network can lead to networked control systems being subject to cyber attacks from time to time,for instance,Do S attacks and deception attacks.Therefore,the key of researching networked control systems is to improve the stability and security of the system.In this article,we mainly analyze the safety and stability of the system and devise the controller in the event-triggered control of the networked control system based on cyber attacks.The research in this paper contains:For the networked control system under single-channel cyber attacks,the hybrid-triggered mechanism is linked with cyber attacks,and the hybrid-triggered controller design problem of the networked control system under cyber attacks is studied.Also,Do S attacks and deception attacks exist in the network communication channel,and the corresponding controller is designed.Moreover,the hybrid-triggered mechanism and the parameters of the controller are obtained.From the results of the study,it is found that this scheme meets the performance requirements and greatly reduces the network communication burden.Due to the presence of random cyber attacks,the problem of hybrid-triggered H_∞control of networked control systems under two-channel attacks is investigated.At first,we designed the hybrid-triggered control scheme consisting of the time-triggered mechanism and the event-triggered mechanism that can be used to reduce adverse effects of cyber attacks.Then,based on the cyber attacks model,a novel switching system model is developed.Moreover,the Lyapunov stability theory is applied to obtain the conditions to keep the system H_∞control stable and design the controller.Finally,some numerical examples confirm the usefulness of the mechanism.For the networked control system under cyber attacks,a dynamic event-triggered mechanism is proposed to ensure saving network resources and reducing the communication burden.By using Lyapunov-Krasovskii functional,some sufficient conditions to make the system impulse free,regular,and asymptotically stable are obtained,and the corresponding controller is designed.Moreover,the desired controller gain is obtained by solving the linear matrix inequality.Finally,some simulation examples are applied to demonstrate the authenticity of the results. |
